Fun
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The same little ribbon keyboard as the monotrons, but with more bells and whistles. (And higher quality output--I didn't notice the annoying hiss that the monotrons all have.) Includes a simple drum machine and 8-step (16-step for the drums) sequencer.

Fun, and not hard to get started with (though a look at the manual will probably help!).

(Also, note: if you also check out the Bliptronic 5000, and have a couple cables with male miniplug cables on both ends, you can try to sync the two. I could only get it to work well with the monotron set at an extremely low tempo and the Bliptronic at one of its highest. But the results could be kinda fun.)